Stereospecific, R2AlCl-Promoted Intramolecular Ene Reaction of a 1,6-Dienoate: Evidence for a Concerted Mechanism
作者:Wolfgang Oppolzer、Sohail Mirza
DOI:10.1002/hlca.19840670312
日期:1984.5.2
provided in high yield the ene product 9 containing 83% 13C localized in the olefinic C(8)-methylene group. Accordingly, H-transfer occurs exclusively from the trans-methyl group of 7, consistent with a concerted ene process 7 9 thereby ruling out an intermediate cation 8 (Scheme 4).
的83%治疗-反式- 13 CH 3 -标记-1,6-二烯酸酯7用Et 2的AlCl在-78°以高收率提供的烯产物9含83%13下,在烯属C个局部(8) -亚甲基团体。因此,H-转移仅从7的反甲基发生,这与一致的烯键过程7 9一致,从而排除了中间阳离子8(方案4)。